/*
 * Copyright (C) 2002-2005 Roman Zippel <zippel@linux-m68k.org>
 * Copyright (C) 2002-2005 Sam Ravnborg <sam@ravnborg.org>
 *
 * Released under the terms of the GNU GPL v2.0.
 */

#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "lkc.h"

/* file already present in list? If not add it */
struct file* file_lookup(const char* name)
{
	struct file* file;
	const char* file_name = sym_expand_string_value(name);

	for(file = file_list; file; file = file->next) {
		if(!strcmp(name, file->name)) {
			free((void*)file_name);
			return file;
		}
	}

	file = xmalloc(sizeof(*file));
	memset(file, 0, sizeof(*file));
	file->name = file_name;
	file->next = file_list;
	file_list = file;
	return file;
}

/* write a dependency file as used by kbuild to track dependencies */
int file_write_dep(const char* name)
{
	struct symbol* sym, *env_sym;
	struct expr* e;
	struct file* file;
	FILE* out;

	if(!name)
		name = ".kconfig.d";

	out = fopen("..config.tmp", "w");

	if(!out)
		return 1;

	fprintf(out, "deps_config := \\\n");

	for(file = file_list; file; file = file->next) {
		if(file->next)
			fprintf(out, "\t%s \\\n", file->name);
		else
			fprintf(out, "\t%s\n", file->name);
	}

	fprintf(out, "\n%s: \\\n"
	        "\t$(deps_config)\n\n", conf_get_autoconfig_name());

	expr_list_for_each_sym(sym_env_list, e, sym) {
		struct property* prop;
		const char* value;

		prop = sym_get_env_prop(sym);
		env_sym = prop_get_symbol(prop);

		if(!env_sym)
			continue;

		value = getenv(env_sym->name);

		if(!value)
			value = "";

		fprintf(out, "ifneq \"$(%s)\" \"%s\"\n", env_sym->name, value);
		fprintf(out, "%s: FORCE\n", conf_get_autoconfig_name());
		fprintf(out, "endif\n");
	}

	fprintf(out, "\n$(deps_config): ;\n");
	fclose(out);
	rename("..config.tmp", name);
	return 0;
}


/* Allocate initial growable string */
struct gstr str_new(void)
{
	struct gstr gs;
	gs.s = xmalloc(sizeof(char) * 64);
	gs.len = 64;
	gs.max_width = 0;
	strcpy(gs.s, "\0");
	return gs;
}

/* Free storage for growable string */
void str_free(struct gstr* gs)
{
	if(gs->s)
		free(gs->s);

	gs->s = NULL;
	gs->len = 0;
}

/* Append to growable string */
void str_append(struct gstr* gs, const char* s)
{
	size_t l;

	if(s) {
		l = strlen(gs->s) + strlen(s) + 1;

		if(l > gs->len) {
			gs->s   = realloc(gs->s, l);
			gs->len = l;
		}

		strcat(gs->s, s);
	}
}

/* Append printf formatted string to growable string */
void str_printf(struct gstr* gs, const char* fmt, ...)
{
	va_list ap;
	char s[10000]; /* big enough... */
	va_start(ap, fmt);
	vsnprintf(s, sizeof(s), fmt, ap);
	str_append(gs, s);
	va_end(ap);
}

/* Retrieve value of growable string */
const char* str_get(struct gstr* gs)
{
	return gs->s;
}

void* xmalloc(size_t size)
{
	void* p = malloc(size);

	if(p)
		return p;

	fprintf(stderr, "Out of memory.\n");
	exit(1);
}

void* xcalloc(size_t nmemb, size_t size)
{
	void* p = calloc(nmemb, size);

	if(p)
		return p;

	fprintf(stderr, "Out of memory.\n");
	exit(1);
}
